Horizontal tube type air preheater circulating fluidized bed boiler

Abstract

The utility model relates to a boiler, in particular to a horizontal pipe type air preheater circulating fluidized bed boiler which comprises a smoke box, an air inlet pipe, a first heat conduction fin, a second heat conduction fin and the like. A plurality of air inlet pipes are transversely and uniformly arranged in the smoke box at intervals, the air inlet pipes penetrate through the smoke box, first heat conduction fins and second heat conduction fins are arranged in the smoke box, the first heat conduction fins and the second heat conduction fins are attached to each other and form a group, and a plurality of groups of first heat conduction fins and second heat conduction fins are uniformly arranged in the smoke box at intervals; the air inlet pipe penetrates through the first heat conduction fins and the second heat conduction fins. By means of the design of the first heat conduction fins and the second heat conduction fins, the contact area of the device and smoke is increased, heat in the smoke is transferred into air in the air inlet pipe, and efficient recovery of the heat is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of boiler, more particularly to a kind of horizontal pipe type air preheater circulating fluidized bed boiler. BACKGROUND

[0002] Circulating fluidized bed boiler is a kind of boiler using fluidized combustion mode, it is one of the highest industrialization degree clean coal combustion technology, it has strong fuel adaptability, high combustion efficiency, good load adaptability and clean combustion and the like advantages, especially suitable for burning difficult solid fuel, so it has been widely applied in power station boiler, industrial boiler and waste disposal and utilization and the like fields.

[0003] Circulating fluidized bed boiler is usually installed air preheater at flue when using, by using flue gas to preheat air, to reduce the loss of coal-fired. But in prior art, the contact area of air preheater and air inlet pipe is limited, the area of air inlet pipe and flue gas heat exchange is small, leading to the utilization rate of air preheater to flue gas is not high, leading to flue gas heat loss.

[0004] Therefore, it is necessary to design a horizontal pipe type air preheater circulating fluidized bed boiler. UTILITY MODEL CONTENTS

[0005] In order to overcome the low utilization rate of air preheater to flue gas in the prior art, the utility model aims at providing a horizontal pipe type air preheater circulating fluidized bed boiler.

[0006] Technical scheme: a horizontal pipe type air preheater circulating fluidized bed boiler, including smoke box, air inlet pipe, first heat-conducting fin and second heat-conducting fin, smoke box is evenly provided with multiple air inlet pipes in transverse direction, and air inlet pipe passes through smoke box, the opposite sides of smoke box are fixedly connected with first heat-conducting fin, and multiple groups of second heat-conducting fins are arranged in transverse direction between first heat-conducting fins, each group of second heat-conducting fins is composed of two mutually adhered second heat-conducting fins, and air inlet pipe passes through first heat-conducting fin and second heat-conducting fin.

[0007] In one embodiment, drive motor is installed on one side of smoke box, output shaft of drive motor is connected with threaded rod, threaded rod extends into the interior of smoke box, and multiple moving blocks fixedly connected with second heat-conducting fin are arranged on threaded rod.

[0008] In one embodiment, mesh plate for filtering flue gas is arranged at the opening of smoke box.

[0009] In one embodiment, first heat-conducting fin is fixedly connected with rotating rod on one side, rotating rod is rotatably connected with swing plate, elastic member, rotating rod is wound with elastic member, and elastic member is connected with first heat-conducting fin and swing plate respectively at both ends.

[0010] In one of the embodiments, the first and second heat-conducting fins are fixedly connected with fixed blocks, and the fixed blocks are fixedly connected with sawtooth pieces.

[0011] In one of the embodiments, the swing plate is provided with grooves for increasing the contact area with flue gas.

[0012] The beneficial effects are: 1. The device and flue gas contact area is increased by the design of the first and second heat-conducting fins, so that the heat in the flue gas is transferred to the air in the air inlet pipe, and the heat is efficiently recovered.

[0013] 2. The second heat-conducting fin in the device can be separated or adjusted to be close to the first heat-conducting fin by the driving of the driving motor, thereby further increasing the contact area of the device and flue gas, improving the heat absorption efficiency of the device, and enhancing the flexibility and adaptability of the device.

[0014] 3. The mesh plate at the front end of the device can effectively filter out the coal cinder impurities carried in the flue gas, prevent them from entering the internal parts of the device and causing wear and tear, not only prolong the service life of the device, but also ensure the stability and reliability of the heat exchange process. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model smoke box.

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the second heat-conducting fin of the utility model.

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the first and second heat-conducting fins of the utility model.

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure of the driving motor, threaded rod and moving block of the utility model.

[0020] Figure 6 It is a schematic diagram of the three-dimensional structure of the second heat-conducting fin and swing plate of the utility model.

[0021] Figure 7 It is a schematic diagram of the three-dimensional structure of the swing plate of the utility model.

[0022] In the drawing mark: 1-smoke box, 1001-air inlet pipe, 2-mesh plate, 3-first heat-conducting fin, 4-driving motor, 4001-threaded rod, 5-moving block, 6-second heat-conducting fin, 7-rotating rod, 8-swing plate, 9-elastic piece, 10-fixed block, 11-sawtooth piece. Detailed Implementation

[0023] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] Example: A horizontal tube air preheater circulating fluidized bed boiler, such as Figures 1-4 As shown, the device includes a smoke box 1, an air inlet pipe 1001, a first heat-conducting fin 3, and a second heat-conducting fin 6. Multiple air inlet pipes 1001 are evenly spaced laterally within the smoke box 1, and each air inlet pipe 1001 passes through the smoke box 1. The first heat-conducting fins 3 and second heat-conducting fins 6 are arranged inside the smoke box 1, with the first heat-conducting fins 3 and second heat-conducting fins 6 attached to each other and forming a group. Multiple groups of first heat-conducting fins 3 and second heat-conducting fins 6 are evenly spaced inside the smoke box 1. The air inlet pipe 1001 passes through the first heat-conducting fins 3 and second heat-conducting fins 6. Here, the first heat-conducting fins 3 are fixedly connected to the inside of the smoke box 1. The two heat-conducting fins 6 are movably connected to the smoke box 1. When the smoke enters the smoke box 1, the first heat-conducting fin 3 and the second heat-conducting fin 6 absorb the heat of the smoke. Then, the first heat-conducting fin 3 and the second heat-conducting fin 6 exchange heat with the contacting air inlet pipe 1001. The first heat-conducting fin 3 and the second heat-conducting fin 6 with higher heat will transfer the absorbed heat to the air inlet pipe 1001 with lower heat, thereby heating the air in the air inlet pipe 1001. Through the array distribution of the first heat-conducting fins 3 and the second heat-conducting fins 6, the contact area between the device and the smoke is effectively increased, thereby improving the heat absorption efficiency of the device.

[0025] like Figure 5 As shown, a drive motor 4 is installed on one side of the smoke box 1. The output shaft of the drive motor 4 is connected to a threaded rod 4001, which extends into the smoke box 1. The threaded rod 4001 is provided with multiple movable blocks 5 that are fixedly connected to the second heat-conducting fins 6. Here, by starting the drive motor 4, the drive motor 4 drives the output shaft to rotate, and the output shaft of the drive motor 4 drives the threaded rod 4001 to rotate counterclockwise, causing the movable blocks 5 to move in the opposite direction of the motor. The movable blocks 5 drive the fixed second heat-conducting fins 6 to move in the opposite direction of the motor, so that the second heat-conducting fins 6 are separated from the first heat-conducting fins 3, thereby further increasing the contact area between the device and the flue gas, improving the heat absorption efficiency, and further improving the utilization rate of the device for the flue gas.

[0026] like Figures 1-3 As shown, a mesh plate 2 for filtering flue gas is provided at the opening of the smoke box 1. Here, the mesh plate 2 is designed to filter the flue gas before it enters the device, intercept the coal slag carried by the flue gas, and effectively prevent the coal slag from entering the inside of the smoke box 1, thereby wearing down the internal parts of the smoke box 1.

[0027] like Figure 6 and Figure 7As shown, the first heat-conducting fin 3 is fixedly connected with a rotating rod 7, the rotating rod 7 is rotatably connected with a swing plate 8, the rotating rod 7 is wound with an elastic member 9, the elastic member 9 is connected with the first heat-conducting fin 3 and the swing plate 8 respectively at two ends, the swing plate 8 is provided with a groove for increasing the contact area with the flue gas, here, the first heat-conducting fin 3 is provided with a square groove for accommodating the swing plate 8, when the first heat-conducting fin 3 and the second heat-conducting fin 6 are separated from each other, the elastic member 9 on the first heat-conducting fin 3 is restored from the compressed state, so that the elastic member 9 drives the swing plate 8 to rotate in the restoring process, and then the swing plate 8 is separated from the square groove, the design of the swing plate 8 makes the flue gas flow in the smoke box 1, and the flue gas is intercepted by the swing plate 8, so that the flue gas flow speed is reduced, thereby increasing the heat exchange time of the first heat-conducting fin 3 and the second heat-conducting fin 6 with the flue gas, and improving the utilization rate of the flue gas.

[0028] As shown in Figure 3 and Figure 6 As shown, the first heat-conducting fin 3 and the second heat-conducting fin 6 are fixedly connected with a fixed block 10 at the bottom, and the fixed block 10 is fixedly connected with a sawtooth piece 11 at the bottom, here, the sawtooth piece 11 is designed to further increase the contact area of the device with the flue gas, and further improve the utilization rate of the device to the flue gas.

[0029] The device is installed at the flue of the circulating fluidized bed boiler, when the flue gas generated by the circulating fluidized bed boiler passes through the flue, the flue gas will pass through the device, and the flue gas will exchange heat with the air inlet pipe 1001 in the device during the flow process, so as to transfer the heat of the flue gas to the air inlet pipe 1001, thereby heating the air in the air inlet pipe 1001. When the flue gas enters the inside of the smoke box 1, the first heat-conducting fin 3 and the second heat-conducting fin 6 will absorb the heat of the flue gas, and then transfer the absorbed heat to the air inlet pipe 1001, thereby heating the air in the air inlet pipe 1001. Through the array distribution of the first heat-conducting fin 3 and the second heat-conducting fin 6, the contact area of the device with the flue gas is effectively increased, thereby improving the heat absorption efficiency of the device, which is helpful to improve the utilization rate of the flue gas and the heating rate of the air inlet pipe 1001.

[0030] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that changes can be made in these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A horizontal-tube air preheater circulating fluidized bed boiler comprising a smoke box (1) and an air inlet tube (1001), the smoke box (1) being provided with a plurality of air inlet tubes (1001) at regular intervals in the horizontal direction, and the air inlet tube (1001) penetrating the smoke box (1), characterized in that, Also include the first heat conduction fin (3) and the second heat conduction fin (6), the inside of the smoke box (1) is provided with the first heat conduction fin (3) and the second heat conduction fin (6), the first heat conduction fin (3) and the second heat conduction fin (6) are mutually pasted and constitute a group, the inside of the smoke box (1) is uniformly provided with multiple groups of the first heat conduction fin (3) and the second heat conduction fin (6), the air inlet pipe (1001) passes through the first heat conduction fin (3) and the second heat conduction fin (6).

2. A recirculating fluidized bed boiler with a horizontal channel air preheater according to claim 1, characterized in that The side of the smoke box (1) is provided with a driving motor (4), the output shaft of the driving motor (4) is connected with a threaded rod (4001), the threaded rod (4001) extends into the inside of the smoke box (1), a plurality of moving blocks (5) are arranged on the threaded rod (4001) and are fixedly connected with the second heat conduction fin (6).

3. A recirculating fluidized bed boiler with a horizontal channel air preheater according to claim 2, characterized in that The opening of the smoke box (1) is provided with a screen plate (2) for filtering smoke.

4. A recirculating fluidized bed boiler with a horizontal channel air preheater according to claim 3, characterized in that The side of the first heat conduction fin (3) is fixedly connected with a rotating rod (7), the rotating rod (7) is rotatably connected with a swing plate (8), an elastic element (9) is wound on the rotating rod (7), and the two ends of the elastic element (9) are connected with the first heat conduction fin (3) and the swing plate (8) respectively.

5. A recirculating fluidized bed boiler with a horizontal channel air preheater according to claim 4, characterized in that The bottom of the first heat conduction fin (3) and the second heat conduction fin (6) is fixedly connected with a fixed block (10), and the bottom of the fixed block (10) is fixedly connected with a sawtooth plate (11).

6. A recirculating fluidized bed boiler with a horizontal channel air preheater according to claim 5, characterized in that The swing plate (8) is provided with a groove for increasing the contact area with the smoke. The swing plate (8) is provided with a groove for increasing the contact area with the smoke.

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